Doorcheck



Nov. 6, 1928.

' 1,690,952 J. C. SCHMIDT ET AL DOOROHEGK Filed May 18, 1927 2Sheets-Sheet 1 INVENTOR5 ATTORNEY Nov. 6, 1928. 1,690,952

J. C. SCHMIDT Er AL DOORCHBCK Filed lay 18, 1927 2 Sheets-Sheet 2 mediumof a cap Patented Nov. 6, 1928.

UNITED STATES PATIENT OFFICE.

JOHN C. SCHMIDT, O! CHICAGO, AND WILLIAM. EICHHOLZ, OF CICEBO, ILLINOIS.

nooncnncx.

Application filed May 18,

l This invention relates to certain novel improvements in door checksand has for its principal object the provision of an improvedconstruction of this character which will be highly efficient in use andeconomical in manufacture.

Among the salient objects of the invention is to provide a door check,of the character hereinafter described, which will function to preventslamming action of the door when moved into closing position eithermanually or by an outside e ent and whereby mechanism is provided w ichis put into operation .by the opening of the door to yieldablyresist theclosing movement of the door without totally stoppin the door in suchmovement. A further 0 ject of the invention is to provide a door check,of the character hereinafter described, which comprises mechanism forieldably restraining without stopping the oor during its 0 ening andclosin movement whereby the oor will gradual y close in the action of aslow steady movement without the usual chatter or vibration.

Other objects will appear hereinafter. The invention consists in thenovel combination and arrangement of arts to be hereinafter describedand claime i The invention will be best understood by reference to theaccompanying drawings, showing the preferred form of construction and inwhich: Fig. 1 is a transverse vertical sectional detail view of theinvention; Fig. 2 is 1 detail view taken substantially on line 2-2 ofFig. 1;

I Fig. 3 is a perspective view of certain of the'braking elementsembodied in the invention; 1 Fig. 4 is a'lperspective view of anoperating arm or be crank embodied in+the invention; and

Fig. 5 is a diagrammatical plan view showing the invention associatedwith a door and a door casing. Referring more partielualrly to thedrawings, showing the preferred form of construction, a housing isindicated at 10. This housin has formed as an integral art thereof bracets 11 which are ada te to be attached to a door 12 through t e mediumof suitable connecting elements 13 The housing 10 has its open topclosedthrough the plate 13 sedured to the housthe medium of -sc'rews14.'

- ing 10 throug 1927.. Serial No. 182,406.

This cap late has a centrally located boss'15 ,formed thereon. andformed in thisboss 15 is 8..08I1t1'81 bore 16 for reasons hereinafterset forth. The housing 10 has formed therein a centrally located here 17and the lower end. portion, termed for'convenience, the'base' 18, isenlarged and has a hollow interior 19. The bore 17 opens excentricallywith respect to the interior 19 of the base 18 for reasons hereinafterset forth. The base 18 is closed through the medium of a suitable cap 20secured to the base by means of screws 21;

Rotatably arranged in the bore 17 is a cylinder 22. This cylinder 22 atits lower end portion is open and provided with an enarged flange 23which enga es the interior wall of the bore 17. Forme as an inte part ofthe cylinder 22 is a. stud 24. stud 24 has a cylindrical ortion 25 whichworks in .the bore 16 and tted to the outer "end portion 26 of the studis an arm 27. This al his arm 27 has an opening 28 formed therein with.one side of, the opening provided with a flat surface 29 adapted toengage a flat surface 30 formed on this outer end portion 29 whereby toprevent rotation of the arm 27 independently of rotation of the stud 24.The arm 27 is held from displacement from the stud 24 through the mediumof a. nut 31 threaded upon a threaded portion 32 of the stud and againsta lock washer 33. Formed in the stud 24 is a passage 34 and arranged ata predetermined point in this passage is a reduced portion 35 having athreaded opening 36 formed therein. The lower end portion of the passage3 tis restricted to provide a seat 37 adapted for engagement with thetapered end portion 38 of the needle39. This needle 39 has anintermediate portion 40 threaded for threaded engagement with thethreaded opening 36 and "the exterior portion of the needle provides'a-finger cap 41 wh'erebyto facilitate adjusting the needle relatEmbracing the -cylinder 22 and arran in the housing 10 is'a coilspring42. en

the various parts are disposed as shownin Fig. 1 this spring 42 is undertension, this beingbrought about in a manner to beset I I forthhereinafter. One end rtion 43 of this coil .spring is connected to. elate 18 as at 44 inany. approved manner. e opposite end portion 45.0fthe sprin 42 is connected to the flange 23 of the cylin er 22 in anyapproved manner.

Movable in the cylinder. 22 is a piston. 46.

ve to the seat 37.

v I I This i'ston 46 hasa. passage 47 formed therein an this passage hasits interior portion 48 ill enlarged and provides a. seat 49 for a'pellet 50arranged" in the enlarged portion 48 of the passage.

Associated with the, piston 46 is a packing structure 51 of any approvedconstruction whereb to revent the escape of air between the cylindrlealwall of the piston and the interior wallof the cylinder 22; The piston46has connected thereto a bolt 52. I.h1s bolt 52 has a threaded endportion 53 and threaded upon this threaded end portion is a nut 54 setin a counter sunk portion 55 of the piston 46. The opposite or exteriorend portion of the bolt 52 provides a slotted head Pivotally connectedto this slotted head through the medium of a pin 57 is one end ears 62and ears 64 is a crank 61.

portioniof a link 58. The opposite end portion of the link 58 isconnected, by means of a. pin 59, to a slotted end portion 60 of a bellThe flange 23 of the cylinder 22 has formed as an integral part thereofspaced ears 62 and carrie by t ese ears 62 is a pin 63 which providespivotal connection between the ears.

and the bell crank 61 which in the present instance is disposed betweenthese ears 62.

' Opposite the ears 62 the flange 23 has formedfas an integral partthereof spaced ears 64 and slidab y arranged between the ush bar 65.This push bar 65 is substantial y U-shaped to provide a lo 'tudinal slot66. At the end portion' 67 d f lzhe push bar 65 there is formed slots 68which extend diagonally in a transverse direction with respect to theseend portions and o rable inthese slots are end or tions 69' o a pin 70.This pin 70 provides connection between-the arm 71 of the bell crank 61and the push bar.65. The push bar I 65 has formed at its bight I rtion72 a trans- I ing 74. This ear 73 is adapted to be pro ect-' Isubstantially arcuate in p an' view and has. up roved manner a' verseear 73 provided wit a vertical 0 ened the slotted head 75 formed as anintegrai part of a brake shoe v76. This head 75 has aligned openings 77formed therein and these openings are adapted toregister with theopenings 74'and projected in these openingsis apin 78 which providespivotal conneotlon between the brake shoe 76. I

The brake shoe 76 in the resent instance is push bar and the a ong itslongitudinal peripheral edges.

- Formed in the end portions 67 of the ush bar 65 are bores 82 andprojected in t ese bores 82 against the action of spring members itionagainst the'sprin cylinder 22. The piston 46 in the cylinder 22 forcesthe air out 83, arranged in these bores, are pins 84 carried by a'plate85 havin formed as an in tegral' part thereof a hea 86. This head 86 hasa beveled surface 87 adapted. for wiping engagement with the interiorwall of the 7 base 18.

The arm 27 has its outer end portion 88 pivotally connected as at 89 toa link 90 iv-s otall connected to a bracket 91 secure to;

:the cor casing 92 with which the door 12 is t associated.

In operation, when the door 12 is moved to open position with respect.to its casin the cylinder 22 will be rotated by action 0 the arm 27. Inrotation of this cylinder 22. the sprin 42 is placed under tension. Whenthe cylin er 22 rotates the ears 62 and 64 act to rotate the push barand'its brake shoe. As

"herein indicated the bore of the cylinder 22 opens excentrically withres act to the bore 19 of the base 18 and when t e cylinder22 is Vrotated the brake shoe will have wiping engagement with the wall of thebore 19 and as rotated the brake shoe will act upon the push bar to movethe same in a longitudinal di-' rection. As this push bar moves in thislon gitudinal direction the bell crank 61 is pivoted about its pin 63and pivots the end ortion 60 thereof in an upward direction. his pivotalmovement of the bell crank in this irection will act u on the link 58and ush the piston 46 inwar to exhaust the air rom the cylinder 22. At tis point it will be noted that the spring 42 is under tension, thepiston 46 in its outer position with respect to the cylinder 22, and-thebrake shoe in a position furthest from the centralaxis of the cylinder.2201 the bore thereof. When the door is released for movement intoclosing posiurged into closing positionby the'spring 42 the brake shoehaving wiping en agement with res ect to the interior wall 0 the bore 19will 0 e'ck this closin movement sufficient .to permit the door to c oseat a slow steady pace. As the door is moved to closing pos1- tion bytheaction of the s ring 42, the brake shoe-46 acts upon the pus bar 65and urges this push bar to move'in a longitudinal direc- 61in an oposite direction to that herein mentioned an as the bell crank pivots inthis through the passage 34 and by reason of the slow escape of the airthrough this ass'age 34 the piston will co-act with the bra e'ehoedirectionthe link 58-.will be caused to act on i to check the movementof thedoor sufliciently enough to permit the door to close at a sloweven pace.

As the piston 46 is movedoutwardly from the cylinder 22 air enters thecylinder 22 through the passage 47, it being pointed out i that as theair passes through this passage 47 into the cylinder 22 the pellet 50will be raised by the air pressure from closing whichwill functionefliciently to control the speed of movement of a door into door closingposition and that the device may be used on any type or weight of door.

It will be' important to note that as the hell I crank 61 pivots ineither of those directions the pin 70 will work along the edges of theslots 68 and thereby prevent chattering or vibration of the push barduring either of those two movements.

While we have illustrated and described the preferred form ofconstruction for carrying our invention into effect, this is capable ofvariation and modification, without d e.

arting from the spirit of the invention. e, therefore, do not wish to belimited to the precise details of construction set forth, but desire toavail ourselves of such variations and modifications as come within thescope of the appended claims.

Having thus described our'invention what we claim asnew and desire toprotect by Letters Patent is: I v v 1. A door check including ahousing-havinga bore formed therein and comprising a base provided witha hollow interior, said bore excentrically opening into the interior ofsaid base, a cylinder rotatably arranged in thebore, a spring memberembracing the cylin der and having'one end ortion connected thereto andan opposite en rtion connected to the housing means for impartingopening movement of a door to said cylinder, a piston movable in thecylinder, a brake shoe rotatably arranged in the interior of said baseand having wiping en a ment with respectto the interior wall 0 t e base,a push bar having connection with said brake shoe, and

means operable by movement, of said cylinder for moving the piston inone directionin the cylinder for urging said push bar to actuate saidbrake shoe for brakingengagement with'res ect to said base. i

' 2. A door 0 eck including a housing having a bore formed therein andcomprising a base provided with a hollow i'nterior, said.

bore excentrically opening into. the interior of said base, a cylinderrotatablyarranged in the bore, a spring member embracing'the cylthecylinder, a valve structure I passage .of air through said. passage, a,coil and having wiping en agementwith respect to the interior wall ofthe base, a push bar having connection with said brake shoe, and meansoperable by movement of said cylinder for moving the piston in onedirection in the cylinder for urgingsaidrpush bar to actuate inwardly.

said brake shoe for braking engagement with respect to said base, saidmeans includin a bell crank pivotally supported by said cylin-' der, aslot and in connection tween one end portion of t e bell crank and saidpush bar, and a' link connection between the opposite end portion of thebell crank and the piston.

ing a central bore formed therein, a base formed on' the housing andhavin a hollow interior arranged concentrically with res ect to thebore, a cylinder rotatably arrange in the bore and having a studextendin exterior of the housing, said stud being provided with apassage to permit exit of air from within the cylinder, a valvestructure controlling passage of air through said passage, meansoperable by the cylinden'for resisting rotation of the cylinder in onedirection, a piston operable in the cylinder, a brake shoe operable onthe interior wall of the base, a push bar rotatable with the cylinderand having connection, with the brake shoe, a head bearing member havingengagement with said wall and having slidable and yieldable connectionwiththe push bar, said push bar having an end portion provided withslots ar- 3. .A door-{check including a housing havranged diagonally andtransversely with rea bell crank pivthe cylinder, a in provber carriedby the piston, and a link connection between said last mentioned memberand the opposite end portion of said bell crank.

'inga central bore formed therein, a base formed on the housing. andhavin a hollow interior'arranged concentrically with res t to the bore,a cylinder rotatably arrange in the bore and having a stud extendingexterior of the housing, said stud'being provided with a passage topermit exit of air from within springeinbracing the cylinder and havingone end P01131011"CODDGCtGdthGIBtO and an opposite end portion-connectedto the brineing for resisting rotation of said cylinder in onedirection, a piston operable in the -c linder, a brake shoe operable onthe interior slots and provi ing con-' A- door check including a housinghav controlling wall of the base, a push bar rotatable with the cylinderand having connection with the brake shoe, a head bearing member havingengagement with said wall and having slidable and yieldable connectionwith the push bar, saidpush bar having an end ortion provided withslots, arranged diagona ly and transversely with respect to the sidesthereof,

a bell crank'pivotally supported by the cyl- 1 inder, a pin projectingthrough said slots and providing connection between one end Eortion' ofthe bell crank and the push bar, a ead bearing member carried by thepiston, and a link connection between said last mentioned member and theopposite end portion of said bell crank.

In testimony whereof we afiix our signatures. 7

JOHN G. SCHMIDT. WILLIAM EICHHOLZ.

